Table 1.

Characteristics of infants of each oxygen concentration group.

Oxygen concentration	40%	60%	100%	P value
Neonates (n)	(17)	(17)	(18)
GA	30.2 ± 2.8	29.3 ± 2.6	28.2 ± 2.7	0.288
BW	1478 ± 409	1278 ± 568	1318 ± 518	0.249
Duration of MV	33.5 ± 15.1	35.6 ± 13.5	34.8 ± 11.4	0.903
Maximum value of O2	40.5 ± 9.2	39.8 ± 8.3	42.1 ± 9.4	0.706

Data are expressed as mean ± standard deviation.

^*P value less than 0.05 was considered significant.

BW, birth weight (g); GA, gestational age (weeks); MV, mechanical ventilation (h); O₂, oxygen concentration (%).